Crystal Oscillator Circuits
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The frequency of a crystal-controlled oscillator is held constant to a high degree of accuracy by the use of a quartz crystal. The frequency depends almost entirely on the dimensions of the crystal (essentially its thickness); other circuit values have.... -
I currently have three: a really old optoelectronics Opto-7000 which I don`t use much, a newer Mitronics MIC-1028, and my most recent acquisition, a used Tektronics 2236 `scope purchased at Dayton 2009, which has a very handy frequency counter built-in. I.... -
This oscillator is a variation of the oscillator presented by Ulrich L. Rohde, DJ2LR, in his article "Evaluating Noise Sideband Performance in Oscillators", Ham Radio, October 1978, Page 51. The original circuit is at the bottom of the web page "4 MHz.... -
The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the.... -
In the figure is the FM modulation circuit of crystal oscillator. FM modulation has direct and indirect FM ways, the direct FM method is to directly change the frequency of the oscillating circuit, it`s simple, but as it is the LC oscillating circuit, the.... -
The oscillator circuit which is composed of the 1MHz quartz crystal resonator and the NAND gate is as shown in the figure, the NAND gate 3 is the output buffer stage. This circuit can be used to calibrate the standard frequency. Figure 1 The 1MHz quartz.... -
The 27MHz quartz crystal oscillator circuit is as shown in figure 1. The biasing circuit is composed of the R1, R2 and R3, C6 is the bypass capacitor. The partial voltage circuit is composed of the C1, C2, C3 and C4 to control the strength of oscillation. L1.... -
This circuit SJT is 1024kHz temperature compensation crystal oscillator. Circuit theoryis asshown. Because output signal level of the circuit is low, the buffer of follow-up transistor VTl is amplified. VTl base bias resistor R2, the load resistor R3, the.... -
Crystal oscillator works as 51MHz crystal( the third harmonic of 17MHz). According to the different structures, the drain - gate capacitance can be selected between 0.5 to 1.8 pF. L2`s turns are about 20% of the L1. 470 ? source resistor can change the.... -
The JFET Pierce oscillator is stable and simple. It can be the clock of a microprocessor, a digital timepiece or a calculator. With a probe at the output, it can be used as a precise injection oscillator for troubleshooting. Attach a small length of wire at.... -
Figure (a) and (b) show the two 2MHZ basic oscillator circuits. According to the circuit structure, it can adjust its best operating point by testing.... -
The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and.... -
The oscillator that is composed of the quartz crystal can be divided into two kinds: the parallel resonant type crystal oscillator and the series resonant type crystal oscillator. The parallel resonant type crystal oscillator and the AC equivalent circuit of.... -
We can create Crystal Colpitts oscillator using a parallel mode crystal and a transistor. The circuit shown by the following figure As an inductance, this.... -
This is a simple JFET pierce crystal oscillator. We can use a wide frequency range of crystal using this circuit without circuit modification. Here is the.... -
Crystal oscillator, especially the low frequency one, can be easily implemented using op-amp as the amplifier. Here is the schematic diagram of such circuit:.... -
This is a 2 MHz crystal circuit using CMOS pair. This circuit is ideal for uses in digital watches and clock because this circuit has low power drain. The.... -
This is an astable multivibrator (oscillator) circuit using CMOS inverter. This circuit uses CD4007 or MC14007. This circuit has operating frequency range of.... -
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the.... -
A 10 MHz crystal is typically 4 ohms at its series resonance and 40 kiloohms at its parallell resonance. To get low sideband noise the power dissipated in the crystal has to be reasonably large, the design used here dissipates 0. 2mW in the crystal, 7mA and.... -
The Fv-1 has internal circuitry to support an external crystal, preferably a 32768Hz watch crystal. These crystals are extremely inexpensive and widely available. Frequencies other than 32768Hz are available, but not as cheap and not as plentiful. If the.... -
Crystal oscillators are those in which a specially-cut crystal controls the frequency. CRYSTAL-CONTROLLED OSCILLATORS are the standard means used for maintaining the frequency of radio transmitting stations within their assigned frequency limits. A.... -
Here is the single- 813 crystal oscillator transmitter, designed by RCA and exhibited in their advertisement on the back page of a "QST" magazine in 1938, and published by RCA in their HamTips bulletin, vol. 1, no. 4, dated December 1938. This transmitter`s.... -
Switchable Output Crystal Oscillator Circuit This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that a.... -
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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